2.5.0 spase://SMWG/Instrument/THEMIS/Ground/UCLA-GBO/GAKO/ASI THEMIS Ground Gakona All Sky Imager GAKO ASI 2023-06-26T12:34:56.789 2023-06-26T12:34:56.789 THEMIS Metadata submitted by J.M. Weygand on 2023-06-26. THEMIS Ground All Sky Imager at Gakona, Alaska. The ASI stations monitor a 170 degree field of view imaging the auroral oval at kilometer resolution. The ASI is comprised of a fisheye lens and CCD (resolution 256 x 256 pixels) in a stainless steel enclosure topped with a transparent acrylic dome. Exposure control ranges from 5 s to 1 ms although the typical data rate is one image every 3 seconds. Silicone heaters keep the instrument within the nominal temperature range. During daylight hours sun shades deploy to protect the CCD. ATHA is part of the Norstar ASI network. We acknowledge NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically: S. Mende and E. Donovan for use of the ASI data. spase://SMWG/Person/Vassilis.Angelopoulos PrincipalInvestigator spase://SMWG/Person/Stephen.B.Mende CoInvestigator spase://SMWG/Person/Eric.Donovan CoInvestigator spase://SMWG/Person/James.M.Weygand MetadataContact Norstar Network https://aurora.phys.ucalgary.ca/norstar/asi/asi.html Norstar web resource for ASI data and information. THEMIS All Sky Imager Instrument http://themis.ssl.berkeley.edu/instrument_asi.shtml Brief description of ASI instrument and links to related papers. NSSDC: THEMIS All Sky Imager https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=THEMIS-GB-01 National Space Science Data Center: ASI description. Imager THEMIS Ground All Sky Imager spase://SMWG/Observatory/THEMIS/Ground/CANMAG/GAKO